This is all good stuff. I like your thorough approach and attention to detail. Couple of comments:
I guess you already know that 164E vented discs and 4-pot calipers will bolt straight on to the Amazon? (At least, I've been reliably told they will - not done it personally).
I did a similar brake upgrade to my Scimitar. I converted the rear drums to discs (Rover discs, Ford calipers, home-made brackets) and fitted Wilwood vented discs and calipers. I used twin separate Wilwood master cylinders with a remote adjustable balance bar, all mounted inside the car on a home-made pedal box similar to yours.
It all worked and was worth the effort.
I can also confirm that you don't need a servo (booster). If you calculate the cylinder/piston ratios carefully (taking into account estimates of dynamic weight distribution pedal leverage of course) you will have strong, easy to use brakes with light pedal prsssure and no need for a servo.
Look forward to more updates
Good luck
John
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